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Add the Amazon Pay Button

[Step 2 of 8] The Amazon Pay checkout experience starts when your buyer clicks on the Amazon Pay button. Add the button wherever buyers start checkout, such as on your product or shopping cart page.


1. Create an Amazon Pay checkout session

Set up an endpoint on your server to Create Checkout Session. Use the Checkout Session object to customize and manage your buyer experience- from the time the buyer clicks on the Amazon Pay button, until they complete checkout. Note that in a later step, you will need the Create Checkout Session response to start the checkout flow.

Use the checkoutReviewReturnUrl parameter to specify the URL which the buyer is redirected to, after they select their preferred shipping address and payment method.

Best practice:

  • Set up your endpoint on the same domain as your website to avoid Cross-Origin Resource Sharing complications.
  • Do not implement caching logic to re-use Checkout Session objects. Your endpoint should make a Create Checkout Session request each time it is invoked.

Optional integrations steps:

  • Use the deliverySpecifications parameter to specify shipping restrictions to prevent buyers from selecting unsupported addresses from their Amazon address book. See address restriction samples for samples how to handle common use-cases.
  • If you registered for Amazon Pay in the EU or UK, you can use the presentmentCurrency parameter to charge your buyer using a different supported currency. See multi-currency integration for more info.

Request

curl "https://pay-api.amazon.com/:environment/:version/checkoutSessions/" \
-X POST
-H "x-amz-pay-idempotency-key: AVLo5tI10BHgEk2jEXAMPLEKEY"
-H "x-amz-pay-authorization: Px2e5oHhQZ88vVhc0DO%2FsShHj8MDDg%3DEXAMPLESIGNATURE"
-d @request_body

Request body

{
    "webCheckoutDetail": {
        "checkoutReviewReturnUrl": "https://a.com/merchant-review-page"
    },
    "storeId": "amzn1.application-oa2-client.8b5e45312b5248b69eeaStoreId",
    "deliverySpecifications": {
        "specialRestrictions": ["RestrictPOBoxes"],
        "addressRestrictions": {
            "type": "Allowed",
            "restrictions": {
                "US": {
                    "statesOrRegions": ["WA"],
                    "zipCodes": ["95050", "93405"]
                },
                "GB": {
                    "zipCodes": ["72046", "72047"]
                },
                "IN": {
                    "statesOrRegions": ["AP"]
                },
                "JP": {}
            }
        }
    }
}  

Request parameters

Name
Location
Description
x-amz-pay-idempotency-key
(required)

Type: string
Header
Idempotency key to safely retry requests
webCheckoutDetail
(required)

Type: webCheckoutDetail
Body
URLs associated to the Checkout Session used to complete checkout. The URLs must use HTTPS protocol
storeId
(required)

Type: string
Body
Login with Amazon client ID. Do not use the application ID

Retrieve this value from "Login with Amazon" in Seller Central
deliverySpecifications

Type: deliverySpecifications
Body
Specify shipping restrictions to prevent buyers from selecting unsupported addresses from their Amazon address book

Response

{
    "checkoutSessionId": "bd504926-f659-4ad7-a1a9-9a747aaf5275",
    "webCheckoutDetail": {
        "checkoutReviewReturnUrl": "https://a.com/merchant-review-page",
        "checkoutResultReturnUrl": null,
        "amazonPayRedirectUrl": null
    },
    "productType": "PayAndShip",
    "paymentDetail": {
        "paymentIntent": null,
        "canHandlePendingAuthorization":false,
        "chargeAmount": null,
        "softDescriptor": null,
        "presentmentCurrency": "USD"
    },
    "merchantMetadata": {
        "merchantReferenceId": null,
        "merchantStoreName": null,
        "noteToBuyer": null,
        "customInformation": null
    },
    "supplementaryData": null, // Amazon Pay system data
    "buyer": null,
    "paymentPreferences": [
        null
    ],
    "statusDetail": {
        "state": "Open",
        "reasonCode": null,
        "reasonDescription": null,
        "lastUpdatedTimestamp": "20191015T204327Z"
    },
    "shippingAddress": null,  // Null for PayOnly product type
    "platformId": null,
    "chargePermissionId": null,
    "chargeId": null,
    "constraints": [
        {
           "constraintId": "BuyerNotAssociated",
            "description": "There is no buyer associated with the Checkout Session. Return the checkout session id to the Amazon Pay Button to allow buyer to login."
        },
        {
           "constraintId": "ChargeAmountNotSet",
            "description": "chargeAmount is not set."
        },
        {
            "constraintId": "CheckoutResultReturnUrlNotSet",
            "description": "checkoutResultReturnUrl is not set."
        },
        {
            "constraintId": "PaymentIntentNotSet",
            "description": "paymentIntent is not set."
        }
    ],
    "creationTimestamp": "20191015T204313Z",
    "expirationTimestamp": "20191016T204313Z",
    "storeId": "amzn1.application-oa2-client.8b5e45312b5248b69eeaStoreId",
    "deliverySpecifications": {
        "specialRestrictions": ["RestrictPOBoxes"],
        "addressRestrictions": {
            "type": "Allowed",
            "restrictions": {
                "US": {
                    "statesOrRegions": ["WA"],
                    "zipCodes": ["95050", "93405"]
                },
                "GB": {
                    "zipCodes": ["72046", "72047"]
                },
                "IN": {
                    "statesOrRegions": ["AP"]
                },
                "JP": {}
            }
        }
    },
    "providerMetadata": {
        "providerReferenceId": null
    },
    "releaseEnvironment": "Sandbox"
}

2. Add the Amazon Pay script

Add the Amazon Pay script to your HTML file. Be sure you select the correct region.

<script src="https://static-na.payments-amazon.com/checkout.js"></script>
<script src="https://static-eu.payments-amazon.com/checkout.js"></script>
<script src="https://static-fe.payments-amazon.com/checkout.js"></script>

3. Render the button

Call amazon.Pay.renderButton to render the Amazon Pay button to an HTML container element. The button will be responsive, and inherit the size of the container element according to the following logic:

  • If no height or width is specified, the button container defaults to 200px by 45px.
  • If only width is specified, the button container height will be set to 45px. The provided width must be between 150px and 500px or container width will be resized to the closest supported value.
  • If only height is specified, the button container width will be set to 500px. The provided height must be between 45px and 192px or container height will be resized to the closest supported value.
  • If both height and width are specified, the button container will be resized to meet these conditions:
    • The container width must be between 150px and 500px. If the provided width is outside those limits, the container width will be resized to the closest supported value.
    • The container height must be between 45px and 192px. If the provided height is outside those limits, the container height will be resized to the closest supported value.
    • The container height:width ratio must be between 1:10 and 1:2.6. If the ratio is outside those limits, the container width will be set to the provided value and the container height will be adjusted to a supported ratio value.

The Amazon Pay script will make an AJAX request using the configuration provided for the createCheckoutSession button parameter. The response must be in JSON format.

The only required parameter is the url. Specify the endpoint you set up in Step 1 as its value. You can customize the request by changing the HTTP request method. If your endpoint does not return the entire Checkout Session object, use extractAmazonCheckoutSessionId to specify the Checkout Session ID parameter in the response.

Code sample

<body>
    <div id="AmazonPayButton"></div>
    <script src="https://static-na.payments-amazon.com/checkout.js"></script>
    <script type="text/javascript" charset="utf-8">
        amazon.Pay.renderButton('#AmazonPayButton', {
            merchantId: 'merchant_id',
            createCheckoutSession: {
                url: 'https://mystore/amazonpay/createcheckoutsession'
            },
            sandbox: true, // dev environment
            ledgerCurrency: 'USD', // Amazon Pay account ledger currency
            checkoutLanguage: 'en_US', // render language
            productType: 'PayAndShip', // checkout type
            placement: 'Cart', // button placement
            buttonColor: 'Gold'
        });
    </script>
</body>
<body>
    <div id="AmazonPayButton"></div>
    <script src="https://static-eu.payments-amazon.com/checkout.js"></script>
    <script type="text/javascript" charset="utf-8">
        amazon.Pay.renderButton('#AmazonPayButton', {
            merchantId: 'merchant_id',
            createCheckoutSession: {
                url: 'https://mystore/amazonpay/createcheckoutsession'
            },
            sandbox: true, // dev environment
            ledgerCurrency: 'EUR', // Amazon Pay account ledger currency
            checkoutLanguage: 'en_GB', // render language
            productType: 'PayAndShip', // checkout type
            placement: 'Cart', // button placement
            buttonColor: 'Gold'
        });
    </script>
</body>
<body>
    <div id="AmazonPayButton"></div>
    <script src="https://static-eu.payments-amazon.com/checkout.js"></script>
    <script type="text/javascript" charset="utf-8">
        amazon.Pay.renderButton('#AmazonPayButton', {
            merchantId: 'merchant_id',
            createCheckoutSession: {
                url: 'https://mystore/amazonpay/createcheckoutsession'
            },
            sandbox: true, // dev environment
            ledgerCurrency: 'GBP', // Amazon Pay account ledger currency
            checkoutLanguage: 'en_GB', // render language
            productType: 'PayAndShip', // checkout type
            placement: 'Cart', // button placement
            buttonColor: 'Gold'
        });
    </script>
</body>
<body>
    <div id="AmazonPayButton"></div>
    <script src="https://static-fe.payments-amazon.com/checkout.js"></script>
    <script type="text/javascript" charset="utf-8">
        amazon.Pay.renderButton('#AmazonPayButton', {
            merchantId: 'merchant_id',
            createCheckoutSession: {
                url: 'https://mystore/amazonpay/createcheckoutsession'
            },
            sandbox: true, // dev environment
            ledgerCurrency: 'JPY', // Amazon Pay account ledger currency
            checkoutLanguage: 'ja_JP', // render language
            productType: 'PayAndShip', // checkout type
            placement: 'Cart', // button placement
            buttonColor: 'Gold'
        });
    </script>
</body>

Function parameters

Parameter
Description
merchantId
(required)

Type: string
Amazon Pay merchant account identifier
createCheckoutSession
(required)

Type: createCheckoutSession
Configuration for calling your endpoint to Create Checkout Session. The response must be in JSON format
placement
(required)

Type: string
Placement of the Amazon Pay button on your website

Supported values:
  • 'Home' - Initial or main page
  • 'Product' - Product details page
  • 'Cart' - Cart review page before buyer starts checkout
  • 'Checkout' - Any page after buyer starts checkout
  • 'Other' - Any page that doesn't fit the previous descriptions
ledgerCurrency
(required)

Type: string
Ledger currency provided during registration for the given merchant identifier

Supported values:
  • US merchants - 'USD'
  • EU merchants - 'EUR'
  • UK merchants - 'GBP'
  • JP merchants - 'JPY'
productType

Type: string
Product type selected for checkout

Supported values:
  • 'PayAndShip' - Offer checkout using buyer's Amazon wallet and address book. Select this product type if you need the buyer's shipping details
  • 'PayOnly' - Offer checkout using only the buyer's Amazon wallet. Select this product type if you do not need the buyer's shipping details
Default value: 'PayAndShip'
buttonColor

Type: string
Color of the Amazon Pay button

Supported values: 'Gold', 'LightGray', 'DarkGray'
Default value: 'Gold'
checkoutLanguage

Type: string
Language used to render the button and text on Amazon Pay hosted pages. Please note that supported language(s) is dependent on the region that your Amazon Pay account was registered for

Supported values: 
  • US merchants - 'en_US'
  • EU/UK merchants - 'en_GB', de_DE', 'fr_FR', 'it_IT', 'es_ES'
  • JP merchants - 'ja_JP'
sandbox

Type: boolean
Sets button to Sandbox environment

Default value: false